Car stalls and backfires into the air box only after warm up

Asked by GuruQLV5H Nov 17, 2019 at 05:07 PM about the 1994 Cadillac DeVille Sedan FWD

Question type: Maintenance & Repair

I got a 1994 Cadillac DeVille with a Northstar
motor recently I was driving it and it just started
backfiring in the throttle body I pretty much had to
hold the pedal all the way to the floor just to get 5
miles an hour to get home after it sits for an hour
or so cools down I guess and start up and runs
fine but after about 15 minutes of warm-up it
starts stalling out and backfiring again

1 Answer
26,835

taver91 answered 5 years ago

Sounds like a failing catalytic Converter (too much back pressure when it heats up).

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